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Rotax 914 / rough running

 
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lgds(at)post6.tele.dk
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PostPosted: Mon Jun 04, 2007 8:05 am    Post subject: Rotax 914 / rough running Reply with quote
Hi all

I have a problem with my Rotax 914 which now have performed 450 hours
without ever missing a hart-beat.
It starts perfect and runs as expected up to 3.000 RPM's.
Above 3.000 it becomes rough and when adding more power it runs even
more and more rough.

Oil press and temp. comes up in normal range.
MP and all other parameters which can be read from the pilots seat (R-
Dat) looks normal - MP goes up to app. 30" but RPM's "stops" at about
3.000 RPMs.
In the engine room visual inspection did not uncover the problem.
All small hoses on top of engine in god condition and the same with
air-filter.
Fuel supply up to carb's checked - working OK.
Spark-plugs checked - looks fine.
Ignition checked - left and right - seems to work normal.

Any suggestions?

Regards Gert
OY-GDS

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topglock(at)cox.net
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PostPosted: Mon Jun 04, 2007 8:30 am    Post subject: Rotax 914 / rough running Reply with quote
Gert,

Make sure the carb springs are not weak and are pulling the carbs, full
open.

Jeff - Baby Blue

Gert Dalgaard wrote:
Quote:


Hi all

I have a problem with my Rotax 914 which now have performed 450 hours
without ever missing a hart-beat.
It starts perfect and runs as expected up to 3.000 RPM's.
Above 3.000 it becomes rough and when adding more power it runs even
more and more rough.

Oil press and temp. comes up in normal range.
MP and all other parameters which can be read from the pilots seat
(R-Dat) looks normal - MP goes up to app. 30" but RPM's "stops" at
about 3.000 RPMs.
In the engine room visual inspection did not uncover the problem.
All small hoses on top of engine in god condition and the same with
air-filter.
Fuel supply up to carb's checked - working OK.
Spark-plugs checked - looks fine.
Ignition checked - left and right - seems to work normal.

Any suggestions?

Regards Gert
OY-GDS
269.8.7/830 - Release Date: 6/3/2007 12:47 PM


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riddon(at)sent.com
Guest
PostPosted: Mon Jun 04, 2007 9:38 am    Post subject: Rotax 914 / rough running Reply with quote
Gert,

Check the throttle cables are running freely. I had one of mine sticking
and kinking in the throttle box causing rough running at higher rev's.

Richard Iddon G-RIXS
--

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m.clews(at)sky.com
Guest
PostPosted: Mon Jun 04, 2007 11:49 am    Post subject: Rotax 914 / rough running Reply with quote
We had very rough running,, and overheating, when the carb rubber connectors
betwen the carbs and the inlet manifolds became loosened.
Mike
G-OMIK
---

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lgds(at)post6.tele.dk
Guest
PostPosted: Mon Jun 04, 2007 12:52 pm    Post subject: Rotax 914 / rough running Reply with quote
Both carb springs renewed with stronger and the bowden-cables to are
brand-new.
Regards Gert


Den 04/06/2007 kl. 18.28 skrev Jeff B:

Quote:


Gert,

Make sure the carb springs are not weak and are pulling the carbs,
full open.

Jeff - Baby Blue

Gert Dalgaard wrote:
>
>
> Hi all
>
> I have a problem with my Rotax 914 which now have performed 450
> hours without ever missing a hart-beat.
> It starts perfect and runs as expected up to 3.000 RPM's.
> Above 3.000 it becomes rough and when adding more power it runs
> even more and more rough.
>
> Oil press and temp. comes up in normal range.
> MP and all other parameters which can be read from the pilots seat
> (R-Dat) looks normal - MP goes up to app. 30" but RPM's "stops" at
> about 3.000 RPMs.
> In the engine room visual inspection did not uncover the problem.
> All small hoses on top of engine in god condition and the same
> with air-filter.
> Fuel supply up to carb's checked - working OK.
> Spark-plugs checked - looks fine.
> Ignition checked - left and right - seems to work normal.
>
> Any suggestions?
>
> Regards Gert
> OY-GDS
> 269.8.7/830 - Release Date: 6/3/2007 12:47 PM




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acrojim(at)cfl.rr.com
Guest
PostPosted: Mon Jun 04, 2007 5:13 pm    Post subject: Rotax 914 / rough running Reply with quote
Gert

On the inlet side of the electric fuel pumps, there is a fuel strainer
screen. It can be removed by using a pick or probe and gentley pulling out.
If you have not cleaned this screen, the fuel flow gets obstructed at higher
rpm's and the engine will miss.

I just hade the same problem, however the missing started at about 5300
RPM's. below that the engine ran smooth.

Jim Brown
N398JB
---

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